Door-check.



PATENTED JAN 10, 1905.

C. ELLINGEN.

DOOR CHECK.

I APPLICATION FILED MAY 5, 1904.

A 7TOHNE Y8 Patented January 10, 1905.

PATENT OFFICE.

CASPER ELLINGEN, OF SANTA BARBARA, CALIFORNIA.

DOOR-CHECK.

SFECIFICATION forming part of Letters Patent No. 779,917, dated January10, 1905. Application filed May 5, 1904. Serial No. 206,574.

To aZZ whom it may concern:

Be it known that I, OAsr ER ELLINGEN, a citi- Zen of the United States,residing at Santa Barbara, in the county of Santa Barbara and State ofCalifornia, have made anew Improvement in Door-Checks, of which thefollowing is a specification.

My invention is an improvement in a class of devices employed forholding swinging doors open. It is more particularly an improvement indevices which are adapted to engage the knob of a door-latch.

A distinguishing feature of my invention is a fixed catch and adoor-knob which are constructively so related to each other that whenthe door swings open the knob is automatically engaged with and lockedby the catch and which may be released by turning it a part of acomplete rotation.

The details of construction, arrangement, and operation in respect tothis and other features of my invention are as follows, reference beinghad to the accompanying drawings, in which Figure l is a perspectiveview illustrating a catch and a door-knob adapted to engage the same,the parts being represented arranged as in use. Fig. 2 is a sectionalview of the catch and knob in position for engagement. Figs. 3 and 4 areviews serving to illustrate the manner of engagement of the catch andknob. Fig. 5 is a section of the knob on line 5 5 of Fig. 3. Fig. 6 is aplan view of the preferred form of catch. Fig. 7 is a sectionillustrating a modification of the catch. Fig. 8 is a plan view ofanother form of catcl I will first describe my preferred form ofinvention.

A indicates a catch which is fixed in position upon the wall X adjacentto the swinging door Y and in such relation to the knob B thereof thatthe knob and catch will engage when the door is swung completely open.As shown, the catch A is formed of a plate a and the T- shaped catchproper, a, the two being formed integrally and the catch projectinghorizontally from the face of the plate. The latter is secured byscrews. It will be noted that the head of the catch is in a verticalplane. The knob B is provided with a narrow rectangular slot 7), whichis located centrally in its face. As shown in Figs. 3 and 4, the edgesof the slot 6 project at diagonally opposite points, such projectionsbeing beveled on the outer side and forming cams Z1, which are adaptedto engage the head of the catch A, as will now be explained. As will beunderstood by reference to Fig. 3, when the knob is in normal positionthe slot 6 thereof is inclined to the vertical at an angle of aboutfifteen degrees. It will be understood, further, that the knob is heldin position by a spring with which a knob-latch is ordinarily provid ed.When the door swings open, the head of the catch being vertical, (seedotted lines, Fig. 3,)it is obvious that two of its diagonally oppositecorners will strike upon the cams or inclines I), and thereby rotate theknob B slightly to the right or far enough to bring the slot 6 into aplane that will permit the head of the catch to enter the slot,whereupon the spring connected with the door-knob rotates the latterback to its normal position, and the cams Z) thus pass behind thecorners of the head of the catch and lock the knob to the latter, asillustrated in Fig. 3. The door-knob is thus automatically engaged bythe catch and remains locked therewith, so that the door is heldsecurely open until the knob is rotated backto the right, which ofcourse again brings the sides of the slot binto substantial parallelism.with the head of the catch B, so that the latter may pass out of theslot and release the door. In Fig. 4 the dotted lines show the catchengaging the cams b and turning the knob to the right.

In order to provide a buffer for the doorknob when engaging the catch, Iarrange two soft-rubber blocks C (see Figs. 3 and 6) in suitableopenings or recesses in plate a on opposite sides of the catch A. (SeeFig. 6.) The bases of these blocks are enlarged or provided with flangeswhich engage the under side of the plate a. so that the buffers are heldin due position without the aid of supplemental devices. It will beunderstood that these buffers require to be set in position before theplate a is screwed to the wall X.

In Fig. 7 I illustrate a modification of the catch in which the catchproper, A, is made separate and detachable from the plate a. The latteris provided with an oblong slot, and the base of the catch A has acorresponding shape, it being elongated and provided at the ends with arabbet or shoulders adapted to engage the plate a at the ends of theslot. Thus the catch A is inserted in place from behind the plate, andwhen the latter is duly secured to the wall the catch is held inposition to engage the door-knob.

In Fig. 8 I show a further modification, the base of the catch A havinga screw (0 formed integrally therewith instead of being made plain, asin Fig. 7.

What 1 claim is 1. The combination of afixed catch having a T shape, amovable door, and a rotatable knob applied thereto, the same having inits face a slot larger than said catch and provided with cam projectionsat opposite points so that the knob is rotated when the catch strikesupon them, as and for the purpose specified.

2. The combination, of the fixed catch having a projecting head, amovable door, and a rotatable knob applied thereto and having its faceprovided with a slot adapted to receive the head of said catch andprovided with surfaces upon which the head of the catch strikes when thedoor is thrown open, thus efiecting rotation of the knob, the head ofthe catch then passing into the slot and locking with the knob,substantially as described.

3. In means for locking a door open, a rotable knob having a slot whosediagonally opposite corners are provided with inclines forming camsadapted to coact with a fixed catch, substantially as described.

4. In means for locking a door open, the catch comprising acatch properhaving a base provided with shoulders, and a base-plate provided with aslot adapted to receive the base of the catch which engages the plate,substantially as described.

CASPER ELLIN GEN \Vitnesses:

Amos W. HART, SoLoN C. K'nMoN.

